Abstract: In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of: C: 0.05-0.20%, Si: 0.1-1.0%, Mn: 0.20-2.0%, P: at most 0.025%, S: at most 0.010%, Cr: 0.05-1.0%, Al: at most 0.10%, if necessary at least one of Mo: at most 0.50%, Ni: at most 1.5%, Cu: at most 0.5%, V: at most 0.2%, Ti: at most 0.1%, Nb: at most 0.1%, and B: at most 0.005%, and also if necessary, at least one of Ca: at most 0.01%, Mg: at most 0.01%, and REM (rare earth elements): at most 0.01%, and a remainder of Fe and impurities is used to produce a steel pipe, and the pipe is then subjected to cold working to predetermined dimensions, then to heating to a temperature of at least the Ac1 transformation temperature followed by quenching, and then to tempering at a temperature no higher than the Ac1 transformation temperature.

Abstract: Provided is an automotive vehicle body structure which is light weight but demonstrates improved mechanical strength during a frontal or side collision. A pair of front side frames extend in a fore-and-aft direction in a mutually spaced relationship in a front part of a vehicle body, and a pair of floor frames having forward ends joined to rear ends of the corresponding front side frames, respectively, extend in the fore-and-aft direction. A first middle cross member is joined to intermediate parts of the floor frames and to lateral ends of side sills. A front cross member is joined to a front side of the first middle cross member, has a pair of lateral ends that are joined to inboard sides of the corresponding front side frames, and is arch shaped such that a fore-and-aft dimension of the front cross member diminishes from each side end toward a middle part.

Abstract: Provided is an automotive vehicle body structure which is light weight but demonstrates an improved mechanical strength during a frontal collision. A pair of front side frames extend in a fore-and-aft direction in a mutually spaced relationship in a front part of a vehicle body, and a pair of floor frames having forward ends joined to rear ends of the corresponding front side frames, respectively, extend in the fore-and-aft direction. A front cross member is provided with a pair of lateral ends that are joined to inboard sides of the rear end portions of the corresponding front side frames, and is arch shaped. A middle cross member is placed behind the front cross member and extends across the floor frames. Tunnel frames extend in a fore-and-aft direction in a central part of the vehicle body to join a dashboard lower panel, front cross member and middle cross member.

Abstract: A rear frame structure for a vehicle is disclosed, wherein an impact load can be satisfactorily absorbed in the case of a collision with a rear surface of the vehicle. The rear frame structure includes a pipe-shaped impact-absorbing member located between left and right rear frames. The impact-absorbing member has a center pipe that has a V shape in plan view, formed so as to protrude backward. The impact-absorbing member has left- and right-side pipes extending from the center pipe linearly upwardly to left and right end pipes. The impact load applied to the center pipe causes the left- and right-side pipes to undergo compressive deformation in their axial longitudinal directions as well as bending deformation towards the front of the vehicle body, whereby the impact load is absorbed.

Abstract: A rear frame structure for a vehicle is disclosed, wherein an impact load can be satisfactorily absorbed in the case of a collision with a rear surface of the vehicle. The rear frame structure includes a pipe-shaped impact-absorbing member located between left and right rear frames. The impact-absorbing member has a center pipe that has a V shape in plan view, formed so as to protrude backward. The impact-absorbing member has left- and right-side pipes extending from the center pipe linearly upwardly to left and right end pipes. The impact load applied to the center pipe causes the left- and right-side pipes to undergo compressive deformation in their axial longitudinal directions as well as bending deformation towards the front of the vehicle body, whereby the impact load is absorbed.

Abstract: Provided is an improved automotive vehicle body structure which is light in weight but demonstrates an improved mechanical strength at the time of a frontal collision. A pair of front side frames (4) extend in a fore-and-aft direction in a mutually spaced relationship in a front part of a vehicle body, and a pair of floor frames (6) having forward ends joined to rear ends of the corresponding front side frames, respectively, and extending in the fore-and-aft direction. A front cross member (13) is provided with a pair of lateral ends that are joined to inboard sides of the rear end portions of the corresponding front side frames, and is given with an arch shape such that a fore-and-aft dimension of the front cross member diminishes from each side end thereof toward a middle part thereof. A middle cross member (14) is placed some distance behind the front cross member and extends across the floor frames.

Abstract: Provided is an automotive vehicle body structure which is light weight but demonstrates improved mechanical strength during a frontal or side collision. A pair of front side frames extend in a fore-and-aft direction in a mutually spaced relationship in a front part of a vehicle body, and a pair of floor frames having forward ends joined to rear ends of the corresponding front side frames, respectively, extend in the fore-and-aft direction. A first middle cross member is joined to intermediate parts of the floor frames and to lateral ends of side sills. A front cross member is joined to a front side of the first middle cross member, has a pair of lateral ends that are joined to inboard sides of the corresponding front side frames, and is arch shaped such that a fore-and-aft dimension of the front cross member diminishes from each side end toward a middle part thereof.

Abstract: In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of: C: 0.05-0.20%, Si: 0.1-1.0%, Mn: 0.20-2.0%, P: at most 0.025%, S: at most 0.010%, Cr: 0.05-1.0%, Al: at most 0.10%, if necessary at least one of Mo: at most 0.50%, Ni: at most 1.5%, Cu: at most 0.5%, V: at most 0.2%, Ti: at most 0.1%, Nb: at most 0.1%, and B: at most 0.005%, and also if necessary, at least one of Ca: at most 0.01%, Mg: at most 0.01%, and REM (rare earth elements): at most 0.01%, and a remainder of Fe and impurities is used to produce a steel pipe, and the pipe is then subjected to cold working to predetermined dimensions, then to heating to a temperature of at least the Ac1 transformation temperature followed by quenching, and then to tempering at a temperature no higher than the Ac1 transformation temperature.

Abstract: In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of: C: 0.05-0.20%, Si: 0.1-1.0%, Mn: 0.20-2.0%, P: at most 0.025%, S: at most 0.010%, Cr: 0.05-1.0%, Al: at most 0.10%, if necessary at least one of Mo: at most 0.50%, Ni: at most 1.5%, Cu: at most 0.5%, V: at most 0.2%, Ti: at most 0.1%, Nb: at most 0.1%, and B: at most 0.005%, and also if necessary, at least one of Ca: at most 0.01%, Mg: at most 0.01%, and REM (rare earth elements): at most 0.01%, and a remainder of Fe and impurities is used to produce a steel pipe, and the pipe is then subjected to cold working to predetermined dimensions, then to heating to a temperature of at least the Ac1 transformation temperature followed by quenching, and then to tempering at a temperature no higher than the Ac1 transformation temperature.

Abstract: A heat insulator apparatus for a vehicle floor, includes a plurality of heat insulating plates interposed between a vehicle floor and an exhaust part disposed below the vehicle floor in such a manner that the mutually adjoining heat insulating plates forms a gap therebetween to thereby form an air passage therebetween, for preventing the heat of the exhaust part from being transmitted to the vehicle floor. At least one of the heat insulating plates is formed such that an air entrance portion of the air passage is narrowed.

Abstract: In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of: 1 C: 0.05-0.20%, Si: 0.1-1.0%, Mn: 0.20-2.0%, P: at most 0.025%, S: at most 0.010%, Cr: 0.05-1.0%, Al: at most 0.

Abstract: A heat insulator apparatus for a vehicle floor, includes a plurality of heat insulating plates interposed between a vehicle floor and an exhaust part disposed below the vehicle floor in such a manner that the mutually adjoining heat insulating plates forms a gap therebetween to thereby form an air passage therebetween, for preventing the heat of the exhaust part from being transmitted to the vehicle floor. At least one of the heat insulating plates is formed such that an air entrance portion of the air passage is narrowed.